1 /* 2 * Virtio RNG Support 3 * 4 * Copyright Red Hat, Inc. 2012 5 * Copyright Amit Shah <amit.shah@redhat.com> 6 * 7 * This work is licensed under the terms of the GNU GPL, version 2 or 8 * (at your option) any later version. See the COPYING file in the 9 * top-level directory. 10 */ 11 12 #ifndef _QEMU_VIRTIO_RNG_H 13 #define _QEMU_VIRTIO_RNG_H 14 15 #include "sysemu/rng.h" 16 #include "sysemu/rng-random.h" 17 18 /* The Virtio ID for the virtio rng device */ 19 #define VIRTIO_ID_RNG 4 20 21 struct VirtIORNGConf { 22 RngBackend *rng; 23 uint64_t max_bytes; 24 uint32_t period_ms; 25 RndRandom *default_backend; 26 }; 27 28 typedef struct VirtIORNG { 29 VirtIODevice vdev; 30 31 DeviceState *qdev; 32 33 /* Only one vq - guest puts buffer(s) on it when it needs entropy */ 34 VirtQueue *vq; 35 36 VirtIORNGConf *conf; 37 38 RngBackend *rng; 39 40 /* We purposefully don't migrate this state. The quota will reset on the 41 * destination as a result. Rate limiting is host state, not guest state. 42 */ 43 QEMUTimer *rate_limit_timer; 44 int64_t quota_remaining; 45 } VirtIORNG; 46 47 #endif 48